Java学习：JDBC快速入门

Person接口

Worker类

Person p = new Worler();

p.eat();

JDBC快速入门

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;

public class JdbcCaiNiao{
    public static void main(String[] args) throws Exception{
        
        //1.导入驱动jar包
        //2.注册驱动
        Class.forName("com.mysql.jdbc.Driver");
        //3.获取数据库连对象
        Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/db3","root","password");
        //4.定义sql语句
        String sql = "update account set balance = 500 where id = 1";
        //5.获取执行sql语句的对象 Statement
        Statement stmt = conn.createStatement();
        //6.执行sql
        int count = stmt.executeUpdate(sql);
        //7.处理结果
        System.out.println(count);
        //8.释放结果
        stmt.close();
        conn.close();
        
    }
}